13,564 research outputs found
Effect on the growth of black tiger prawn Penaeus monodon by supplementation of squid viscera meal.
No full textLC compensators for power factor correction of nonlinear loads
No full textThis material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Brunel University's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. Copyright @ 2004 IEEEA method is presented for finding the optimum fixed LC compensator for power factor correction of nonlinear loads where both source voltage and load current harmonics are present. The LC combination is selected because pure capacitive capacitors alone would not sufficiently correct the power factor. Optimization minimizes the transmission loss, maximizes the power factor, and maximizes the efficiency. The performance of the obtained compensator is discussed by means of numerical examples
LC compensators based on transmission loss minimization for nonlinear loads
No full textThis material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Brunel University's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. Copyright @ 2004 IEEEThis paper presents a method employing the penalty function search algorithm to determine the LC compensator value for the optimal power factor correction in nonsinusoidal systems. The objective of the proposed method is to minimize the transmission loss while the power factor and efficiency are taken as constraints and utilized in order to solve the multiobjective optimization problem by transforming it into a single objective one. Examples show that the load nonlinearity can have a significant impact on optimal compensator sizes
Révision de la thèse de doctorat : "El otro urbanismo de Le Corbusier. Una mirada atenta a su legado urbanístico"
No full text[EN] Doctoral thesis review:
Juan Andrés Rodríguez LoraEl otro urbanismo de Le Corbusier. Unamirada atenta a su legado urbanísticoDirectores: María Teresa Pérez Cano - Daniel Navas Carrillo - Marta SequeiraEscuela Técnica Superior de Arquitectura de la Universidad de Sevilla22 de septiembre de 2023[ES] Recensión tesis doctoral:
Juan Andrés Rodríguez LoraEl otro urbanismo de Le Corbusier. Unamirada atenta a su legado urbanísticoDirectores: María Teresa Pérez Cano - Daniel Navas Carrillo - Marta SequeiraEscuela Técnica Superior de Arquitectura de la Universidad de Sevilla22 de septiembre de 2023[FR] Révision de la thèse de doctorat :
Juan Andrés Rodríguez LoraEl otro urbanismo de Le Corbusier. Unamirada atenta a su legado urbanísticoDirectores: María Teresa Pérez Cano - Daniel Navas Carrillo - Marta SequeiraEscuela Técnica Superior de Arquitectura de la Universidad de Sevilla22 de septiembre de 2023Martí Ciriquián, P. (2024). Recensión tesis doctoral: "El otro urbanismo de Le Corbusier. Una mirada atenta a su legado urbanístico". LC. Revue de recherches sur Le Corbusier. (9):230-231. https://doi.org/10.4995/lc.2024.20853OJS230231
A comparison of the antagonisms by neostigmine and diaminopyridine against the neuromuscular block caused by cobrotoxin and (+)-tubocurarine.
No full textCost-effective applications of power factor correction for nonlinear loads
No full textThis material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of Brunel University's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to [email protected]. Copyright @ 2005 IEEEThe objective of this paper is to propose a new approach for designing passive LC compensators by using the penalty function method as an optimization tool. The performance of the cost-effective passive LC compensator for a constant load depends on the appropriate inductor and capacitor selection. Several design methods are reviewed and a novel design methodology is proposed in this paper. By using the proposed method, the designer can quickly find appropriate parameter values to meet the desired circuit performance. Simulated results show that an appropriate combination of the inductor and capacitor selected by the proposed method can meet the desired power-quality requirement. Different cases of design examples are shown in this paper to verify the performance of the proposed design methodology
A 155W −95.6 dB THD+N GaN-based Class-D Audio Amplifier With LC Filter Nonlinearity Compensation
No full textSilicon MOSFETs-based medium-power (< 50W) Class-D amplifiers (CDAs) switching in the MHz range have gained popularity in recent years, which achieves better linearity thanks to a higher loop gain in the audio band while enabling the use of LC filters with higher cut-off frequencies. However, for high-power (>100 W) CDAs, such switching frequency and high load current could lead to significant power loss. Furthermore, in the presence of a large current and voltage applied to the load, the linearity of the system can quickly degrade due to LC filter component voltage/current dependency. Without any LC filter nonlinearity compensation technique, LC components with high voltage/current rating must be used to reach high system linearity, which are often expensive and bulky. This paper presents a CDA using a GaN-based output stage to achieve high switching frequency and good efficiency simultaneously, and an integrated controller implemented in a 180nm CMOS technology to compensate for the LC filter nonlinearity. Switching at 1.8 MHz, the CDA can deliver a maximum of 155W from a 50V supply into a load with a peak efficiency of 91.7%. It achieves a peak THD+N of −95.6 dB (0.0017%) while allowing the use of cheaper and smaller nonlinear LC components.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsMicroelectronic
A - 121.5-dB THD Class-D Audio Amplifier With 49-dB LC Filter Nonlinearity Suppression
No full textClass-D audio amplifiers produce electromagnetic interference (EMI), which often needs to be suppressed by an external LC filter. However, due to component nonlinearity, this filter can itself cause significant distortion. This article presents a class-D amplifier that suppresses LC filter nonlinearity by 49 dB and is robust to ±30% variations in its cutoff frequency. This is achieved by a dual-loop architecture, in which an inner loop provides stability, while an outer loop provides the high gain needed to suppress the LC filter and output-stage nonlinearity. A prototype, implemented in a 180-nm BCD process, achieves -121.5-dB total harmonic distortion (THD) and -107.1-dB THD+N, which is maintained to within 3 dB even as the LC filter cutoff frequency is varied from 62 to 106 kHz. It can deliver a maximum of 21 W into a 4-Ω load with 87% efficiency and 12 W into an 8-Ω load with 91% efficiency, measured at 10% THD. Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic InstrumentationMicroelectronic
LC Archive. Allégories du souvenir. Sur les polaroïds de Gabriel Campuzano consacrés à l' oeuvre de Le Corbusier
No full text[EN] The Polaroid images created by photographer and architect Gabriel Campuzano convey a sense of engagement with someone else s memories, of shared experience. The changes Campuzano brings to these familiar views of Le Corbusier s architecture constitute a kind of clinging, deforming overlay. This defamiliarisation supplants the security and certainty of the known and shatters the relationship between signifier and signified, creating an open-ended array of possible links between the two. This article reflects on Campuzano s use of Polaroid film, colour, and framing, both in his work as a whole and, more specifically, in his approach to some of Le Corbusier s most iconic architectural creations, gauging the difference between solid fact the photographed structure and what is known about it and the experience of its contemplation. The result corroborates the hypothesis that Gabriel Campuzano s Polaroid snaps of Le Corbusier s work facilitate a communion of untransferable memories: a coming together of allegorical reminiscences that augments the ineffable magnitude of the architecture portrayed.[ES] Las imágenes polaroids realizadas por el fotógrafo y arquitecto Gabriel Campuzano producen la sensación de estar ante el recuerdo de otro; de una vivencia compartida. Las modificaciones que Campuzano realiza sobre estas estampas familiares de la obra arquitectónica de Le Corbusier actúan como una suerte de capa superpuesta que se adhiere sobre ellas, deformándolas. Este extrañamiento usurpa la seguridad de lo conocido y quiebra la relación entre significante y significado, creando un campo incompleto de relaciones entre ambos. Las técnicas utilizadas por Campuzano a partir de la película Polaroid, el uso del color y a los encuadres de las imágenes, tanto en la generalidad de su obra como, específicamente, en su acercamiento a ciertas arquitecturas icónicas de Le Corbusier, son reflexionadas en este texto, midiendo las distancias entre lo comprobable la obra fotografiada y su conocimiento- y la experiencia de su contemplación. Se corrobora así la hipótesis de que las polaroids de Gabriel Campuzano dedicadas a la obra de Le Corbusier auspician una comunión de memorias intransferibles: un encuentro convocado por estas alegorías del recuerdo, que amplía la dimensión indecible de estas arquitecturas.[FR] Les images de Polaroid effectuées par le photographe et architecte Gabriel Campuzano transmettent la sensation de se trouver face au souvenir d un autre ; d une expérience partagée. Les modifications réalisées par Campuzano sur ces images familières de l uvre architectonique de Le Corbusier agissent comme une sorte de couche superposée s adhérant sur elles, en les déformant. Cette étrangeté trouble la sécurité de ce qui est connu et brise le rapport entre signifiant et signifié, en créant un champ incomplet de rapports entre les deux. Les techniques utilisées par Campuzano à partir du film Polaroid, l usage de la couleur et l encadrement des images, aussi bien dans la généralité de son uvre que, concrètement, dans son approche de certaines architectures iconiques de Le Corbusier, sont soumises à réflexion dans ce texte, en mesurant les distances entre ce qui est vérifiable -l uvre photographiée et sa connaissance- et l expérience de sa contemplation. C est ainsi que se confirme l hypothèse selon laquelle les Polaroids de Gabriel Campuzano consacrées à l uvre de Le Corbusier présagent une communion de mémoires intransférables : une rencontre convoquée par ces allégories du souvenir, qui amplifie la dimension indicible de ces architectures.De La Cova Morillo-Velarde, MÁ.; Campuzano Artillo, G. (2022). Archivo LC. Alegorías del souvenir. Sobre las polaroids de Gabriel Campuzano dedicadas a la obra de Le Corbusier. LC. Revue de recherches sur Le Corbusier. (6):219-238. https://doi.org/10.4995/lc.2022.18238OJS219238
Multichannel LC ADC: to Record Atrial Electrograms
No full textBiosignals such as electoencephalogram (EEG), electrocorticogram (ECoG), atrial electrogram (AEG) etc. are being recorded from multiple channels simultaneously to improve the spatial resolution of the signals. Conventional multichannel synchronous Analog-to-Digital Converters (ADCs) are used to convert the analog continuous time signals into discrete digital values. Several biosignals have a sparsity in time domain as they have fast-rising peaks in between periods of low activity. Use of conventional synchronous ADCs for conversion of such signals is not an efficient approach as their operation is constant, irrespectiveof the activity of the input signals. Asynchronous ADCs such as level-crossing (LC) ADCs exploit the sparsity of biosignals and thus their operation is activity-dependent. However, multichannel configurations of LC ADCs do not yet exist. This problem is investigated in this work and a new ADC architecture is presented that can combine synchronous sampling with level-crossing quantisation method while converting input signals from several channels simultaneously. The synchronous LC ADC presented in this work achieves 3.37 times reduction in quantisation steps and 6 times reduction in number of output bits generated during conversion of AEG signals as compared to conventional synchronous ADCs. The problem in existing LC ADCs of data overhead in adaptive resolution technique is solved through a novel method named split resolution technique which is also presented in this work.Electrical Engineerin
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